STUDY ON PETROLEUM SYSTEMS IN ZHU- Ⅲ SUBBASIN OF SOUTH CHINA SEA

Based on the study of petroleum geological features in Zhu-Ⅲ Subbasin of South China Sea,the authors determined the main sources,reservoirs and caprocks in the subbasin by analysizing the relationship of oil(gas)and source rocks in this paper.Moreover,according to the newest definition of petroleum system,the author identified the petroleum systems in Zhu Ⅲ Subbasin by analysizing the characteristics of its tectonics and deposition.The study indicated that there were different oil(gas)systems in Zhu Ⅲ Subbasin at different periods.Namely,there were only one oil system in Wenchang A depression in the early and five oil(gas)systems in the whole subbasin in the late.Finally,the authors also studied the rules of oil(gas)migration and the features of pool forming in these systems.